<template>
    <div>
        <!-- 面包屑 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 面包屑 -->


        <!-- 卡片试图区域  -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon :closable="false">
            </el-alert>

            <!-- 步骤条区域 -->
            
            <el-steps  :active="activeIndex-0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            
           
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">

            <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                            
                            <!-- 选择商品分类的级联选择框 -->
                            <el-cascader
                            expand-trigger="hover"
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange">
                            </el-cascader>

                    </el-form-item>
                </el-tab-pane>

                <el-tab-pane label="商品参数" name="1">
                     <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                            
                        </el-checkbox-group>

                    </el-form-item>
                    
                </el-tab-pane>

                <el-tab-pane label="商品属性" name="2">

                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.atrr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>

                </el-tab-pane>

                <el-tab-pane label="商品图片" name="3">
                    <!-- action 表示图片要上传到的后台API地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            :headers="headerObj"
                            :on-success="handleSucces"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                            
                        </el-upload>

                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">

                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>


                    <!-- 添加商品的按钮 -->
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>

                </el-tab-pane>
            </el-tabs>
            </el-form>


        </el-card>

        <!-- 图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%"
        >
        <img :src="previewPath" alt="" class="previewImg">
       
        </el-dialog>

    </div>
</template>
<script>
import _ from 'lodash'

export default {
    data(){
        return{
            activeIndex:'0',
            //添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类数组
                goods_cat:[],
                //图片的数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    {required:true,message:'请输入商品名称',trigger:'blur'}
                ],
                goods_price:[
                    {required:true,message:'请输入商品价格',trigger:'blur'}
                ],
                goods_weight:[
                    {required:true,message:'请输入商品重量',trigger:'blur'}
                ],
                goods_number:[
                    {required:true,message:'请输入商品数量',trigger:'blur'}
                ],
                goods_cat:[
                    {required:true,message:'请选择商品分类',trigger:'blur'}
                ]

            },
            //商品分类列表
            catelist:[],
            //
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            //动态参数列表数据
            manyTableData:[],
            //静态属性列表数据
            onlyTableData:[],
            //上传图片的URL地址
            uploadURL:'http://localhost:60956/api/upload',
            //图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            //
            previewPath:'',
            //
            previewVisible:false

        }
    },
    methods:{
            //获取所有商品分类数据
            async getCateList(){
               const {data:res} =await this.$http.get('categories')

                if(res.meta.status!==200){
                    return this.$message.error('获取商品分类失败')
                }

                this.catelist=res.data.catelist
                console.log(this.catelist)

            },
            //级联选择器选中项变化，会触发这个函数
            handleChange(){
                if(this.addForm.goods_cat.length!==3){
                    this.addForm.goods_cat=[]
                }
                console.log(this.addForm.goods_cat)
            },
            //切换时是否选择了商品分类
            beforeTabLeave(activeName,oldActiveName){
                // console.log('即将离开的标签页名字是：'+oldActiveName)
                // console.log('即将进入的标签页名字是：'+activeName)

                if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
                    this.$message.error('请选择商品分类')
                    return false
                }

            },
            async tabClicked(){
                //console.log(this.activeIndex)
                //证明访问的是动态参数面板
                if(this.activeIndex==='1'){
                    console.log(this.cateId)
                 const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                
                    if(res.meta.status!==200){
                        return this.$message.error('获取动态参数列表失败')
                    }

                    console.log(res.data)
                    res.data.forEach(item=>{
                     item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                        
                    })
                    this.manyTableData=res.data

                }else if(this.activeIndex==='2'){
                const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                
                if(res.meta.status!==200){
                    return this.$message.error('获取静态属性失败')
                }

                    console.log(res.data)
                    this.onlyTableData=res.data

                }

            },
            //处理图片预览效果
            handlePreview(file){
                console.log(file)
                this.previewPath=file.response.data.url
                this.previewVisible=true
            },
            //处理移除图片的操作
            handleRemove(file){
                console.log(file)
                // 1. 获取将要删除的图片的临时路径
                const filePath=file.response.data.tmp_path
                // 2.从pics 数组中，找到这个图片对应的索引值
                const i= this.addForm.pics.findIndex(x=>
                x.pic===filePath)
                // 3.调用数组的splice 方法，把图片信息对象，从pics 数组中移除
                this.addForm.pics.splice(i,1)
                console.log(this.addForm)

            },
            //监听图片上传成功的事件
            handleSucces(response){
                console.log(response)
                //1.拼接得到一个图片信息对象
                const picInfo={pic:response.data.tmp_path}
                //2.将图片信息对象，push到pics数组中
                this.addForm.pics.push(picInfo)
                console.log(this.addForm)

            },
            //添加商品
            add(){
                this.$refs.addFormRef.validate
                (async valid=>{
                    if(!valid){
                        return this.$message.error('请填写必要的表单表单项')
                    }

                    //执行添加的业务逻辑
                    // lodash   cloneDeep(obj)
                    const form =_.cloneDeep(this.addForm)
                    form.goods_cat=this.addForm.goods_cat.join(',')
                    //处理动态参数
                    this.manyTableData.forEach(item=>{
                        const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                        this.addForm.attrs.push(newInfo)
                    })
                    //处理静态属性
                    this.onlyTableData.forEach(item=>{
                        const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs=this.addForm.attrs
                    console.log(form)

                    //发起请求添加商品
                    //商品的名称，必须是唯一的
                   const {data:res}=await this.$http.post('goods',form)

                   if(res.meta.status!==201){
                       return this.$message.error('添加商品失败')
                   }

                   this.$message.success('添加商品成功')
                   this.$router.push('/Goods')

                })
            }


    },
    created(){
        this.getCateList()
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length =='3'){
                return this.addForm.goods_cat[2]
            }
                return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-breadcrumb{
    margin-bottom: 15px;
    font-size: 12px;
}
.el-card{
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.15) !important;
}
.el-table{
    margin-top: 15px;
    font-size: 12px;
}
.el-steps{
    margin: 15px 0;
}
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}

</style>